#ceph IRC Log

Index

IRC Log for 2015-02-06

Timestamps are in GMT/BST.

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[2:07] <flaf> cholcombe973: I think hammer is not yet released.
[2:08] <flaf> So, to my mind, the answer is
[2:08] <flaf> nope
[2:08] <kraken> http://i.imgur.com/iSm1aZu.gif
[2:08] <flaf> :)
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[2:09] <cholcombe973> flaf: yeah i'm using the dev deb's :)
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[2:09] <flaf> Ah sorry, in this case, I don't know. Sorry.
[2:10] <flaf> I'm not brave enough to use dev versions ;)
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[2:25] <cholcombe973> well this is a new error in ceph hammer: stale version stamp 4
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[2:28] <cholcombe973> it says in the log file there's a filestore update script but i don't see where it is
[2:30] <evilrob> going back through my ceph deployment with more of an eye of automating it. When looking at adding a node, it's just OSDs and maybe a monitor right? (using ceph deploy)
[2:31] <cholcombe973> evilrob: could you clarify?
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[2:33] <evilrob> Say I've got 5 nodes and I'm adding 2 more. From my (limited) understanding at this point, I should add OSDs on the new nods for the new storage, and add another monitor to one of the nodes.
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[2:34] <cholcombe973> yeah you either want 1, 3 or 5 monitors. preferably 3
[2:34] <cholcombe973> firing up osd's on the new storage sounds fine
[2:34] <evilrob> right now I have one node. had a hardware failure on my second node during install. Getting remote hands to fix that in the morning. Thought I'd take a moment to nail down expanding
[2:34] <cholcombe973> right
[2:35] <cholcombe973> so on your single node you have 1 monitor + X osds?
[2:35] <evilrob> so going from 5 nodes, 3 monitors to 7 nodes, 3 is still ideal?
[2:35] <cholcombe973> yeah 3 is still ideal
[2:35] <evilrob> right now yes. 1 mon, 34 OSDs
[2:35] <evilrob> cool
[2:35] <cholcombe973> there's a note on the docs that says as you add monitors you're monitor cluster slows down due to paxos rounds taking longer
[2:37] <evilrob> cool... this is a deploy in a datacenter that might have another year left in it. So while I'd like to get it "right", using it as a learning experience is realistic.
[2:37] <cholcombe973> then you're going to have to migrate?
[2:37] <evilrob> inheriting (initially) 3 boxen with 34 4TB drives each
[2:37] <cholcombe973> nice, that's some beefy machines
[2:37] <evilrob> not migrate really... new data centers, new sets of data.
[2:37] <cholcombe973> gotcha
[2:38] <cholcombe973> so you're golden
[2:38] <evilrob> we'll archive most of what we put in here and toss it
[2:38] <cholcombe973> sounds like some nice data to work with
[2:38] <cholcombe973> i like data you can archive and trash :D
[2:39] <evilrob> expandability and reliability will be key. This is write once, read "maybe".
[2:39] <cholcombe973> lol
[2:39] <evilrob> roughly 3% of this data will be accessed at a later date
[2:39] <cholcombe973> piece of cake then
[2:40] <evilrob> our devs are asking about performance ceph vs wombat. any ideas there?
[2:40] <cholcombe973> wth is wombat?
[2:41] <evilrob> oh... forget I asked. I just realized it's an in-house hack-up
[2:41] <cholcombe973> hahaha
[2:41] <evilrob> I'm the relatively new guy that doesn't have a case of "not invented here"
[2:41] <cholcombe973> nice :)
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[2:41] <cholcombe973> don't drink the kool-aid
[2:42] <evilrob> I've seen some very NIH cases. it's a bad thing.
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[2:42] <evilrob> very bad that is
[2:42] <cholcombe973> the performance of ceph can be quite good if you tune it up
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[2:42] <cholcombe973> i had 3 racks setup at my last job that were doing 3GB/s all day long
[2:43] <evilrob> nice
[2:43] <cholcombe973> if they complain about performance add more nodes
[2:44] <cholcombe973> so long as their write size is about 256K or bigger than it'll be good
[2:44] <cholcombe973> lower than that and you'll need to smack people over the head to lump data together
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[3:09] <evilrob> cholcombe973: thanks for the feedback. our typical object is 300Kish, large ones 1.2M
[3:11] <cholcombe973> evilrob: 1M is great
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[3:11] <cholcombe973> i'm gonna sign off for the day
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[8:22] <sc-rm> classicsnail: I have done all of the steps to remove the osd???s no longer existing, but the host keeps in the # ceph osd tree http://paste.openstack.org/show/167929/
[8:22] <sc-rm> classicsnail: the host I want to get rid of is host node-43
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[8:23] <sc-rm> classicsnail: the host is down and gone, so where is it ceph keeps track of hosts and how do I get rid of it.
[8:24] <sc-rm> classicsnail: This is just a test setup and I???m going to have a lot of replacing hosts over time, so I don???t want my osd tree to be filled with obsolete information.
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[9:11] <ZyTer> hi
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[9:12] <ZyTer> i setup a new cluster, i have 2 sata OSD, and 1 SSD for cache
[9:13] <ZyTer> when i do : ls -al /var/lib/ceph/osd/ceph-0/ i saw a symbolic link : journal -> /dev/sdc1
[9:13] <ZyTer> but when i check by ceph-disk list
[9:14] <ZyTer> i can see:
[9:14] <ZyTer> /dev/sdc : /dev/sdc1 other, 0x83 /dev/sdc2 other, 0x83
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[9:16] <ZyTer> why i dont see : "/dev/sdc1 ceph journal, for /dev/sdd1" ??
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[9:20] <boichev> When using RBD for VM storage does the traffic go first to the monitor and from the monitor to the PG or it goes directly to the PG ?
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[9:39] <nigwil> boichev: the block read/writes go directly to the OSDs (which are participating in the PG)
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[9:41] <boichev> nigwil thanks
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[9:47] <boichev> nigwil so there is no problem to add a second ceph node and instal another cinder-volume on top of it ?
[9:49] <boichev> and rise the replication to two
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[9:55] <nigwil> yes can add nodes, it will distribute the existing data
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[9:56] <nigwil> the new default replicas is 3 (for safety), 2 is is ok if you don't mind some risk of losing data
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[9:58] <Be-El> hi
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[10:00] <boichev> nigwil adding nodes is ok for ceph but I was wondering if adding cinders to the openstack is ok ... if for some reason openstack requires some chanes from the second cinder-volume node then going to the backend into ceph ..... ceph will again hit the right PG right
[10:02] <nigwil> yes you need to set cinder.conf to reference the RBDdriver, and give it the path to the ceph.conf (so it can find MONs etc)
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[10:04] <nigwil> the path is more like Cinder --> RBD --> Ceph MONs, then the Ceph client on your Cinder service can then talk directly to the OSDs and find the pool which then has the PGs (if that makes sense)
[10:04] <nigwil> I guess you're looking at this: http://ceph.com/docs/next/rbd/rbd-openstack/
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[11:45] <swami1> loicd: Here is pull request of organizationmap file - https://github.com/ceph/ceph/pull/3651
[11:45] * loicd looking
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[11:46] <swami1> loicd: Thanks.....Will be sending the same the respective people for review
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[11:46] <loicd> Mykola Golub is with mirantis
[11:46] <sleinen1> I spent this morning looking at Graphite graphs from our Ceph cluster, and then wrote up this blog post: http://blog.simon.leinen.ch/2015/02/ceph-deep-scrubbing-impact.html
[11:46] <loicd> I wonder if we have a shorter email for him
[11:47] <loicd> swami1: Mykola Golub <mgolub@mirantis.com>
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[11:49] <swami1> loicd: yes...I have seen the company as Mirantis...but is some other tags added...so I need confirm with him before adding...
[11:49] <swami1> loicd: email id shows as : Mykola Golub <mgolub@zhuzha.mirantis.lviv.net>
[11:50] <loicd> swami1: ah ok. https://github.com/swamireddy/ceph/commit/71c6d98979ac26fb37b94172316cb65c475bc6e4 shows the mirantis email
[11:50] <loicd> asking is good in any case
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[11:52] <boolman> sleinen1: nice article. are you using SAS 15k RPM disks? how many SSD's do you have per OSD-node ?
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[11:53] <swami1> loicd: Will confirm with him and update the mailmap also...that was I prefere. is this make sense?
[11:53] <loicd> swami1: absolutely
[11:54] <sleinen1> boolman: No, the disks are 7200rpm (WD SE2). We have two SSDs per OSD node (currently we only use one of them - I know, that's not very efficient to do, but we're still learning how to provision these things???)
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[11:54] <swami1> loicd: Thanks...emails will go for each one for reivew...based on thier feedback, will take actions
[11:54] <loicd> great :-D
[11:55] <boolman> sleinen1: intreseting, I'm about to setup something similar. Have you done some benching? what can I expect from a similar setup :)
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[12:00] <sleinen1> boolman: We have done a few benchmarks, but I don't have numbers handy and don't know whether you could use them to project performance. The cluster seems to perform "well" for our purposes most of the time. But the impact of background work (especially rebalancing, e.g. when adding many disks) sometimes causes pain for us. That's why I'm eager to try I/O (de)priorization as mentioned in loicd's blog post that's cited in my article.
[12:02] <sleinen1> boolman: Oh and all the net's (redundant) 10GE, maybe I should have mentioned that in the post. Though maybe that can be assumed "state of the art" by now...
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[12:11] <swami1> loicd: ????mgolub@zhuzha.mirantis.lviv.net - DNS Error: Address resolution of??zhuzha.mirantis.lviv.net. failed: Domain name not found
[12:12] <swami1> loicd: email delivery failed for the above email id...
[12:13] <loicd> swami1: :-) Mykola Golub <mgolub@mirantis.com> is working though, right ?
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[12:15] <swami1> loicd: OK. Will this email id..
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[12:18] <loicd> swami1: note that the https://github.com/swamireddy/ceph/blob/master/.mailmap link that is included in the mail sent to the authors show an outdated .mailmap. You could either change it to https://github.com/ceph/ceph/blob/master/.mailmap or push a more recent version of master to your repository. I'm nitpicking, nobody noticed I'm sure ;-)
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[12:22] <Be-El> sleinen1: the solution for the changing device names is using /dev/disk/by-id/.. or something similar instead of /dev/sdX. if you are using puppet for provisioning you might need to modify the manifests, since most of them cannot handle the symlinks in /dev/disk/by-X
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[12:25] <sleinen1> Be-El: thanks. We try to use a global Puppet configuration for all OSD nodes, and that's difficult with the by-id method. A colleague still needs to work on this.
[12:30] <swami1> loicd: Thanks for finding this...yep its old one..will push latest master..give a min...
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[12:42] <Be-El> sleinen1: if the hosts are similar enough, you can use filesystem labeling during initial provisioning
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[12:45] <Be-El> what's the best practice to shutdown a complete ceph cluster? we have a datacenter power supply maintenance next weekend, and i need to shutdown all servers
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[12:46] <Be-El> is setting noout, shutting down the osds and finally the mons enough?
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[12:47] <sleinen1> Be-El: Yes, labeling at system provisioning time is a good option. But when we provisioned the hosts, we didn't know yet how many disks we'd actually want to use for Ceph OSDs. So we wrote Puppet recipes to create new OSDs on a defined set of disks per node. And that mechanism (unfortunately) uses the /dev/sd* names.
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[12:48] <sleinen1> Your shutdown procedure looks sound. But (fortunately) I don't think I ever had to shut down an entire Ceph cluster...
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[12:50] <Be-El> restart is more challenging, since some nodes host both a mon and osds
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[12:57] <swami1> loicd: Updated my clone repo with latest.
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[13:15] <classicsnail> Be-El: I've had that process work multiple times just fine
[13:15] <classicsnail> Be-El: in the case of restart, we have initial monitors set, and we can generally just hit the power buttons on all the machines at once, and it comes back quickly
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[13:15] <classicsnail> but if you're paranoid, monitors first, then osds, ensuring you had noout set
[13:16] <Be-El> classicsnail: thx for the info
[13:16] <Be-El> classicsnail: i should be able to establish a mon quorum without starting a single osd
[13:16] <classicsnail> oh, definitely
[13:17] <classicsnail> you just cannot access data, all pools being degraded and incomplete
[13:17] <classicsnail> I've not had a ceph cluster lose data even with the power was pulled from it due to DC failure, except if I was playing with cephfs
[13:17] <Be-El> sure, but that situation should become better after the osds come back online
[13:17] <classicsnail> I've had cephfs blow up on me far too many times
[13:17] <classicsnail> oh, definitely
[13:18] <classicsnail> the reason for the noout is that it won't try a rebuild of missing replicas as things come back
[13:18] <Be-El> does the mon store the noout flag in the osd map?
[13:19] <classicsnail> I'm fairly certain it does
[13:19] <classicsnail> I can't test it for you right now, but I'm sure I've had the noout flag persist across restarts
[13:20] <Be-El> well, if something goes wrong it will be a very long weekend...
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[14:59] <adam1> Going through http://ceph.com/docs/master/rbd/rbd-openstack/, specifically the section for compute nodes
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[14:59] <adam1> The text says: "Nodes running nova-compute need the keyring file for the nova-compute process."
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[14:59] <adam1> Which keyring file?
[14:59] <adam1> I've already done the part about the cinder key
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[15:17] <magicrobotmonkey> is it normal for most of the osd logs to be totally empty on a healthy cluster?
[15:17] <magicrobotmonkey> even while im writing to it at a pretty good clip?
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[15:25] <sleinen> I don't know??? ours are never quite empty, but sometimes I think we just have noise in them.
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[15:25] <sleinen> To exclude problems with log rotation, I'd run a "sudo fuser" on the log files and check whether there's actually a process that has them open.
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[15:28] <magicrobotmonkey> i did some HUPing
[15:28] <magicrobotmonkey> and the previous rotation all had some data
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[16:33] <winston-d_> Not sure if anyone met situation like this before, when I tried to add new ceph mon to a 1-mon-only cluster, it stuck
[16:33] <kraken> ???_???
[16:35] <winston-d_> is that even possible? i mean adding new mons to a cluster that has only 1 mon.
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[16:42] <Be-El> winston-d_: that's how every cluster mit >1 mon starts
[16:42] <Be-El> eh..with even
[16:42] <Be-El> winston-d_: without an error description noone will be able to help you
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[16:46] <winston-d_> Be-El: well, when I do 'ceph mon add', it stuck at '2015-02-06 07:37:25.498744 7f5afd75e700 0 monclient: hunting for new mon' forever
[16:47] <Be-El> does the ceph command stuck, or the mons itself?
[16:47] <Be-El> and does the mon log file contain more informatin?
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[16:47] <winston-d_> Be-El: the ceph command stuck, the mon log file looks fine, nothing strange appears
[16:48] <Be-El> winston-d_: does the ceph configuration contain an initial mon (the existing one) and both mons as mon host?
[16:49] <Be-El> winston-d_: and does the mons actually find each other?
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[16:51] <winston-d_> Be-El: no, I haven't changed ceph conf yet, should I do that first before I actually added the mon?
[16:52] <oms101> I think 2 ius the worst number of mons you can have , 1 or 3 are sane small numbers
[16:52] <oms101> and yes the mons need to know of each other and come to consensus.
[16:52] <winston-d_> oms101: how can I bump to number from 1 to 3? adding two mons in one single command?
[16:53] <Be-El> winston-d_: the ceph.conf file has to contain at least the existing mon. all commands and daemon use the conf file to find the mons
[16:53] <oms101> I have never tried -> always used 1 or 3 on my test setups, and only added to 3 mon node clusters
[16:54] <Be-El> winston-d_: you can add them one by one, but oms101 is right. you need an odd number of mons for a stable setup
[16:54] <oms101> ^^^ I would definitely update the conf file before calling it a disarster
[16:54] <winston-d_> Be-El: yes, ceph.conf have the existing mon, this cluster has been up & running for a while
[16:54] <winston-d_> ok, i'm updating the ceph.conf
[16:54] <Be-El> winston-d_: and the second mon is able to connect to the first mon?
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[16:57] <winston-d_> Be-El: yes, they are on the same L2 network, and I ping/ssh from both sides, if that's what you mean by 'able to connect'.
[16:57] <oms101> firewalls for example :)
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[16:57] <winston-d_> oms101: nope, no firewalls between them
[16:58] <Be-El> winston-d_: the mon log should show some entries if the mons are able to find and connect to each other
[16:59] <oms101> so make sure mon nodes know of each other :)
[16:59] <oms101> (conf file)
[16:59] <oms101> maybe restart mon deamons
[17:01] <oms101> sorry <winston-d_> gotta run and fix soem thing
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[17:03] <winston-d_> oms101: sure, thx for the help!
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[17:16] <winston-d_> Be-El, oms101: looks like the trick is to start the ceph-mon first, and then do 'ceph mon add'
[17:16] <Be-El> do both mon now work?
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[17:16] <winston-d_> Be-El: yup
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[17:16] <Be-El> great. adding a third one should be easy now
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[17:18] <winston-d_> Be-El: hopefully, doing it now.
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[17:18] <oms101> <winston-d_> well done -> ops I forgot to say "start the ceph-mon first"
[17:18] <kraken> http://i.imgur.com/HUKCsCv.gif
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[17:25] <winston-d_> oms101, Be-El: Now 3 mons are all up & running, thx for your help
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[17:26] <Be-El> winston-d_: you're welcome
[17:26] <oms101> you are welcome :)
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[17:28] <winston-d_> another (maybe not related) question about 'public network' in ceph.conf, is this config option supposed to list all public networks for all mons and OSDs, if they are not in the same subnet.
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[17:30] <Be-El> i think its used for binding to the correct interface
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[18:10] <adam1> How is instance storage in OpenStack handled in Ceph?
[18:10] <adam1> That's not clear from the guide on the ceph.com site.
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[18:11] <gleam> nova/cinder creates rbd block devices using the python librbd bindings
[18:11] <gleam> (rbd block devices is redundant, i know, just saying it for clarity)
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[18:12] <adam1> Is any configuration for that needed beyond what's in the guide?
[18:12] <gleam> i think the guide covers it all
[18:12] <adam1> To clarify, I'm referring to what used to be in /var/lib/nova/instances
[18:12] <gleam> make sure you're on juno or the forked+patched icehouse nova tree
[18:13] <adam1> Okay. I did see references to that, but thought I could get away with using straight icehouse. Ah well.
[18:13] <adam1> Thanks for the confirmation.
[18:14] <gleam> yeah, with icehouse you get cinder/glance working fine, but not nova for ephemeral storage
[18:14] <gleam> so you can "boot from image (create new volume)" in horizon parlance just fine
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[18:14] <gleam> but not just boot from image
[18:16] <adam1> Yes, that fits with my experience so far...
[18:16] <adam1> Perhaps an upgrade is for the best anyway.
[18:16] <adam1> Thanks again.
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[19:04] <bsanders> I'm trying to understand how Ceph handles writes. What I think happens is that a client sends a write to the primary OSD, which then journals it and forwards it (in parallel?) to the other N OSD's who also journal it (where N = pool size - 1). Then the Primary ACK's the write back to the client. Sometime later, each of the OSD's will commit that write from Journal to Data.
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[19:05] <gregsfortytwo> yes, data to primary, primary to replicas, all OSDs journal data, replicas ack to primary, primary acks to client after it gets replica and local acks
[19:08] <bsanders> gregsfortytwo: Awesome, thanks.
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[19:23] <bsanders> Follow up to the last question, for client access, the Primary OSD in an acting set handles all read requests?
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[19:28] <smiley_> Is there a way to remove all objects from a pool...without deleting the pool?
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[19:32] <CephTestC> Is there any way to upgrade Ceph RDB image version from 1 to 2?
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[19:43] <CephTestC> I answered the question on my own...
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[19:44] <CephTestC> rbd export libvirt-pool/my-server - | rbd import --image-format 2 -
[19:44] <CephTestC> > libvirt-pool/my-server2
[19:44] <CephTestC> > rbd rm libvirt-pool/my-server
[19:44] <CephTestC> > rbd mv libvirt-pool/my-server2 libvirt-pool/my-server
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[19:45] <smiley_> Is there a way to remove all objects from a pool...without deleting the pool?
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[23:02] <Enigmagic> qq, does osd replication also go through the journals? i'm assuming yes.
[23:03] <gregsfortytwo> yes, all disk writes go through the journal
[23:03] <Enigmagic> that's what i thought, thanks :-)
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[23:05] <ShaunR> with a replica of 3, with a 3 server (each with 3 osds) setup, can i assume i'm only going to get the speed of 3 disks for read/write?
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[23:12] <gregsfortytwo> roughly that, yes
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